Is miso gluten-free? It depends on the miso
It depends on the miso. Miso is fermented soybean paste, but it’s made with a starter (koji) grown on a grain, and that grain decides the answer.
- Barley miso (mugi miso, ้บฆๅณๅ) contains barley, so it contains gluten.
- Rice miso (kome miso, ็ฑณๅณๅ) and soybean miso (mame miso, ่ฑๅณๅ) avoid barley, but check the label too: some blends add barley or wheat.
Miso soup in restaurants
Even with a rice miso, some restaurants season the soup or its stock with soy sauce, and most soy sauce contains wheat; instant dashi mixes can also contain wheat or soy sauce. Ask which miso they use and whether soy sauce goes into the soup. Instant miso soup sachets vary, so read the pack.
Cooking at home
Buy miso labelled gluten-free, or a rice or soybean miso whose ingredient list shows no barley and no wheat. Then season with gluten-free soy sauce or tamari.
Keep reading
- The Hidden-Gluten Watchlist: the 15 forbidden names and the ones to check
- Is soy sauce gluten-free?
- How to say gluten-free in Japanese
- Gluten-free Japan: our country page
Sources: Codex Alimentarius (gluten-free = 20 mg/kg or less), EU Regulation 828/2014, Coeliac UK, NHS. We inform, we don’t diagnose: for medical questions, your doctor or dietitian has the last word.
Reviewed against the HTGF methodology: every claim sourced, every listing tiered and dated. This article is practical guidance, not medical advice.
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